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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/ext4/bitmap.c
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 */
10
11#include <linux/buffer_head.h>
12#include "ext4.h"
13
14unsigned int ext4_count_free(char *bitmap, unsigned int numchars)
15{
16 return numchars * BITS_PER_BYTE - memweight(bitmap, numchars);
17}
18
19int ext4_inode_bitmap_csum_verify(struct super_block *sb,
20 struct ext4_group_desc *gdp,
21 struct buffer_head *bh)
22{
23 __u32 hi;
24 __u32 provided, calculated;
25 struct ext4_sb_info *sbi = EXT4_SB(sb);
26 int sz;
27
28 if (!ext4_has_metadata_csum(sb))
29 return 1;
30
31 sz = EXT4_INODES_PER_GROUP(sb) >> 3;
32 provided = le16_to_cpu(gdp->bg_inode_bitmap_csum_lo);
33 calculated = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
34 if (sbi->s_desc_size >= EXT4_BG_INODE_BITMAP_CSUM_HI_END) {
35 hi = le16_to_cpu(gdp->bg_inode_bitmap_csum_hi);
36 provided |= (hi << 16);
37 } else
38 calculated &= 0xFFFF;
39
40 return provided == calculated;
41}
42
43void ext4_inode_bitmap_csum_set(struct super_block *sb,
44 struct ext4_group_desc *gdp,
45 struct buffer_head *bh)
46{
47 __u32 csum;
48 struct ext4_sb_info *sbi = EXT4_SB(sb);
49 int sz;
50
51 if (!ext4_has_metadata_csum(sb))
52 return;
53
54 sz = EXT4_INODES_PER_GROUP(sb) >> 3;
55 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
56 gdp->bg_inode_bitmap_csum_lo = cpu_to_le16(csum & 0xFFFF);
57 if (sbi->s_desc_size >= EXT4_BG_INODE_BITMAP_CSUM_HI_END)
58 gdp->bg_inode_bitmap_csum_hi = cpu_to_le16(csum >> 16);
59}
60
61int ext4_block_bitmap_csum_verify(struct super_block *sb,
62 struct ext4_group_desc *gdp,
63 struct buffer_head *bh)
64{
65 __u32 hi;
66 __u32 provided, calculated;
67 struct ext4_sb_info *sbi = EXT4_SB(sb);
68 int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
69
70 if (!ext4_has_metadata_csum(sb))
71 return 1;
72
73 provided = le16_to_cpu(gdp->bg_block_bitmap_csum_lo);
74 calculated = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
75 if (sbi->s_desc_size >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_END) {
76 hi = le16_to_cpu(gdp->bg_block_bitmap_csum_hi);
77 provided |= (hi << 16);
78 } else
79 calculated &= 0xFFFF;
80
81 return provided == calculated;
82}
83
84void ext4_block_bitmap_csum_set(struct super_block *sb,
85 struct ext4_group_desc *gdp,
86 struct buffer_head *bh)
87{
88 int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
89 __u32 csum;
90 struct ext4_sb_info *sbi = EXT4_SB(sb);
91
92 if (!ext4_has_metadata_csum(sb))
93 return;
94
95 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
96 gdp->bg_block_bitmap_csum_lo = cpu_to_le16(csum & 0xFFFF);
97 if (sbi->s_desc_size >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_END)
98 gdp->bg_block_bitmap_csum_hi = cpu_to_le16(csum >> 16);
99}
1/*
2 * linux/fs/ext4/bitmap.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 */
9
10#include <linux/buffer_head.h>
11#include <linux/jbd2.h>
12#include "ext4.h"
13
14unsigned int ext4_count_free(char *bitmap, unsigned int numchars)
15{
16 return numchars * BITS_PER_BYTE - memweight(bitmap, numchars);
17}
18
19int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
20 struct ext4_group_desc *gdp,
21 struct buffer_head *bh, int sz)
22{
23 __u32 hi;
24 __u32 provided, calculated;
25 struct ext4_sb_info *sbi = EXT4_SB(sb);
26
27 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
28 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
29 return 1;
30
31 provided = le16_to_cpu(gdp->bg_inode_bitmap_csum_lo);
32 calculated = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
33 if (sbi->s_desc_size >= EXT4_BG_INODE_BITMAP_CSUM_HI_END) {
34 hi = le16_to_cpu(gdp->bg_inode_bitmap_csum_hi);
35 provided |= (hi << 16);
36 } else
37 calculated &= 0xFFFF;
38
39 return provided == calculated;
40}
41
42void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
43 struct ext4_group_desc *gdp,
44 struct buffer_head *bh, int sz)
45{
46 __u32 csum;
47 struct ext4_sb_info *sbi = EXT4_SB(sb);
48
49 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
50 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
51 return;
52
53 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
54 gdp->bg_inode_bitmap_csum_lo = cpu_to_le16(csum & 0xFFFF);
55 if (sbi->s_desc_size >= EXT4_BG_INODE_BITMAP_CSUM_HI_END)
56 gdp->bg_inode_bitmap_csum_hi = cpu_to_le16(csum >> 16);
57}
58
59int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
60 struct ext4_group_desc *gdp,
61 struct buffer_head *bh)
62{
63 __u32 hi;
64 __u32 provided, calculated;
65 struct ext4_sb_info *sbi = EXT4_SB(sb);
66 int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
67
68 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
69 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
70 return 1;
71
72 provided = le16_to_cpu(gdp->bg_block_bitmap_csum_lo);
73 calculated = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
74 if (sbi->s_desc_size >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_END) {
75 hi = le16_to_cpu(gdp->bg_block_bitmap_csum_hi);
76 provided |= (hi << 16);
77 } else
78 calculated &= 0xFFFF;
79
80 if (provided == calculated)
81 return 1;
82
83 return 0;
84}
85
86void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
87 struct ext4_group_desc *gdp,
88 struct buffer_head *bh)
89{
90 int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
91 __u32 csum;
92 struct ext4_sb_info *sbi = EXT4_SB(sb);
93
94 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
95 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
96 return;
97
98 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
99 gdp->bg_block_bitmap_csum_lo = cpu_to_le16(csum & 0xFFFF);
100 if (sbi->s_desc_size >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_END)
101 gdp->bg_block_bitmap_csum_hi = cpu_to_le16(csum >> 16);
102}